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Ocean Science An interactive open-access journal of the European Geosciences Union

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doi:10.5194/os-2016-91
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Technical note
06 Jan 2017
Review status
This discussion paper is under review for the journal Ocean Science (OS).
Wave spectral shapes in the coastal waters based on measured data off Karwar, west coast of India
M. Anjali Nair and V. Sanil Kumar Ocean Engineering Division, Council of Scientific & Industrial Research-National Institute of Oceanography, Dona Paula 403 004, Goa, India
Abstract. Understanding of the wave spectral shapes is of primary importance for the design of marine facilities. In this paper, the wave spectra collected from January 2011 to December 2015 in the coastal waters are examined to know the temporal variations in the wave spectral shape. For 31.15 % of the time, peak frequency is between 0.08 and 0.10 Hz and the significant wave height is also relatively high (~ 1.55 m) for waves in this class. The slope of the high-frequency tail of the monthly average wave spectra is high during the Indian summer monsoon period (June–September) compared to other months and it increases with increase in significant wave height. There is no much interannual variation in slope for swell dominated spectra during the monsoon, while in the non-monsoon period when wind-seas have much influence, the slope varies significantly. Since the high-frequency slope of the wave spectrum is within the range 3–4 during the monsoon period, Donelan spectrum shows better fit for the wave spectra in monsoon months compared to other months.

Citation: Nair, M. A. and Kumar, V. S.: Wave spectral shapes in the coastal waters based on measured data off Karwar, west coast of India, Ocean Sci. Discuss., doi:10.5194/os-2016-91, in review, 2017.
M. Anjali Nair and V. Sanil Kumar
M. Anjali Nair and V. Sanil Kumar
M. Anjali Nair and V. Sanil Kumar

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Short summary
Information on wave spectral shapes required for designing the marine structures is presented based on wave data collected from January 2011 to December 2015 in the coastal waters of eastern Arabian Sea. Variations in high-frequency tail of the wave spectrum in different months are presented. The slope of the high-frequency tail of the monthly average wave spectra is high during the Indian summer monsoon period (June–September) compared to other months.
Information on wave spectral shapes required for designing the marine structures is presented...
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